- New Cards
It's easy to print cards that eschew taxing without much creative effort. It would be preferable if Wizards printed cards that were conscious of the taxing problem. The main issue with that right now is that this has been the best argument since 2010. No one has any faith left that this will happen or patience for that matter. This is doubly confounding because they now have a specific venue for printing Eternal legal cards that have no effect on Standard or Modern (Conspiracy, Commander). The fact they have refused to utilize this has been a repeated slap in the face for those of us that believed issues regarding Standard and Modern were the biggest practical barriers to effective printings.
- Workshop Itself
It's an act of extreme generosity that Mishra's Workshop is unrestricted despite being so over the line in every objective metric. The corollary to keeping it around is that more of the toys end up having to be regulated. If there are complaints about a restricted list with Lodestone Golem, Thorn, Revoker, and Chalice, we should wonder "would we rather unrestrict two or three of those and restrict Mishra's Workshops?" I would hope the answer would be no.
When R&D is designing cards, their goal is "sell as many packs as possible". They absolutely do not have time or motivation to give two poops about Vintage. Maybe they give half a poop on a good day, because they have Grandpa Belcher in the office nowadays, but realistically Standard is their bread and butter, with also a little casual play (Commander, Conspiracy, Un Sets).
If they were smart though, they would try to do these things. Like when Delve is a huge part of your block, make a delve Shatter. Make a Phyrexian mana Shatter. And so on.